This is a vintage Anchor Hocking Forest Green Glass Pitcher.  This pitcher is known for its distinctive forest green color and was produced by Anchor Hocking, a prominent American glassware manufacturer.  Many of these pitchers feature an "ice lip" and a D-shaped handle, and they were popular for serving beverages like iced tea, water, or lemonade.  These pieces are considered collectible examples of mid-century glassware and are often sought after by enthusiasts of vintage kitchenware and home decor.